It is my understanding that a plane gets a shaker if the wing does not give sufficient buffet to feel the stall, and a pusher if the plane is difficult to recover from a stall. Wings designed for high Mach numbers generally have airfoils that don't give much buffet close to stall, and have lots of sweep which make it hard or impossible to get the nose down in a stall. A T tail can make this worse, but does not necessarily require a shaker. Look at the CJ's. They have a t tail, but not much sweep, and a more forgiving airfoil. No pusher is required because it will come out of a stall easily.